Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesTrigonometrical ratios of sum and difference of two and three angles
Medium$1+\cos 10^{\circ}+\cos 20^{\circ}+\cos 30^{\circ}=$
- A$4 \sin 10^{\circ} \sin 20^{\circ} \sin 30^{\circ}$
- B$4 \cos 5^{\circ} \cos 10^{\circ} \cos 15^{\circ}$
- C$4 \cos 10^{\circ} \cos 20^{\circ} \cos 30^{\circ}$
- D$4 \sin 5^{\circ} \sin 10^{\circ} \sin 15^{\circ}$
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